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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3bc0c4377ba20c28cd789f2f894ab6a5eaee38049809c8f14dfb43da3dcfa803' 
  AND token = 'nrAbccpjbcS2zGJByyUT8qn1Phpzy+L7b9COT6rR1M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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