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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736dd966b7d53e6c9b666319ee50605ef82a6a89414a89ad93881f3b2240965f' 
  AND token = 'yiXScBD62bZMEmqyHeQskHs+RVyhzbS9vUVfeJTI8Dw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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