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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a2a784b3a7a9d2f9e65954972c0703a5c3d33d4b5ec7b907ea89cbb667ec8ae' 
  AND token = 'Dc7J8ITvVR0As08tVQV4HMypcqPIPghXCR3toeMDr70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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