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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f017af1ac1c0e5c23c4e99f31eb6df960b8c6d0facd90be0f4d2db5f51542ad3' 
  AND token = 'hg2c51QwIdS8YP7X8Q3+6H1HV0B3ptxuqRyN8ZI0ehY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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