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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae0f50ce5593b2c0cb14be26e8ea8a81a8749374450de3f8bf483edaa6f6a470' 
  AND token = 'f6DWLNzw87G5YskUHnZT/csxslsnCkS0UKJl9esYDss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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