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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1edccee6d56cd39b1ad8c0467ad41e3306007704a491f302037b40cd3e2b3bf' 
  AND token = 'iWF8DsJc2EehzQqODVlpHLFTjgosY/1Y+3iH8YpssBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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