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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7507c44ebdaff3ef9dfeb72279ba18508dda605319b74e3a978615cc0cfa17d' 
  AND token = 'T93Xle/Z5z+rGsnL5Fz+nPJ2LekQ8l0pA+qAam0m6HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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