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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bff8308fe20b018fa303b1596c7f023d9f5561008cd2e30b90732a5963d9ac4' 
  AND token = 'Zl3N6knh9p6y6MUlyTaw5scPxTT3V8gms8km3ORI060=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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