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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b243ffc6d6869f7b75abc3c1bb1f2a1cb738bb70d77d8630be6891d75c5f13a' 
  AND token = '5MrZeKcw010Rgw0IcWM7bjeFvJOt3uTvjvS9E/59BKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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