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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '603ab764e4532094b52da10731215defa4a5095d09c475039bfb33c844ad59e9' 
  AND token = 'yCL9MCHbu1APHIr6x5i+XC2eAPjU9713TOLHesqg8Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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