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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f015415f8d9e58377d98bd9b4e20e6c0ac35c0b81f5ad97ccee59f855b9a394' 
  AND token = 'NMkkbomy1FKRV1ZHVkjKM/quek1V91ce+odRbN+iDSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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