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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26a30d7ae453ad5f3c592b1a6eaed275e742fdbcb532219b1edf6f646cb4418b' 
  AND token = '0VuderVmDbn9Q7HoxWKFLQ31BF5yUapU/QCGYSUxq/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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