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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0337f60aac9584bedd308b536a8ccabde44858ff8e838f883a79145b956e2244' 
  AND token = 'JA9pPBF9mzUHNtDd8YkcYI6bo5kkrQvO5reT8SPwyqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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