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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a89931dd080d29fb1ac1ba3cd74e997957d34adfa8c601c7f7a3ec63fe4cc0e' 
  AND token = 'gpdO7nUodSzFoDNfhqFinDMsoAnfmeinW2Inco0SiQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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