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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c9c7837b8c6b3164b46149fbce394828799be09490bbf0161d1bf0d1760b4e7' 
  AND token = 'vJQAW3BZr0llte0gmJEG6jVJWcTTx9L63rKuIc9uuSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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