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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dba16a962cd1dc79f1f3b02c680c1d9955b2eb1d4fca0f87c0b038d632d9259' 
  AND token = 'da0mE3GXC873imXxb3g0KIppSViamieF/IX9aeLgM4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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