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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c621eaa2f28a1b2e98328db9fe9d43bc79afba70dbbdc8699408fb85b920098e' 
  AND token = 'UvagM5x1lmubzeffMuh2HThTfi1Yp8Q132F1Nn1qnuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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