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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa472c28ee24fec4e8049e22b29286f831dd04aad85429a67818cef4af3fe594' 
  AND token = 'K2ciSLU8CwB6OISq48bcYICBqeK1WwmNQTLmHF9HSAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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