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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31e3d69597d1665dcaecdc2ad65cd857d20ffa09979987d2977515a396ae5e7' 
  AND token = 'a4HZ4KNu8Pj9aKAzSTXsfYq2yykWiABVTVtktyNqtZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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