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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd38b1dbcd2e8974ba3b3c3ed0e3d9412dcf7b6b630f0d50b7f17a415703bb66c' 
  AND token = 'DZxaG1LhfnmBW2PNKUQGMv7ft3O9ueYnT1qZy2HrSvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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