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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79f3e23fa23cbf69294d818d8aa31c285f95fa9c16caf8d761eae99740c6b26' 
  AND token = 'GeDVxDiCfM846ekuwUWm+xpagK8oi6g5asUn7e3Tx40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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