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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92e529025e7d8acfccfbf2a113adaa020cbd6e912a7967a51bfd729a76017b6' 
  AND token = '2XOwTsrqxyyEbH0amZoKg+hIEYzRpAOdZSREw3OPt58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}