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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9ea5013be0467e91b48158bc2938f6f2c8cf949ddc5c13866f826dbe4c0152' 
  AND token = '8Kc+smTg3jmOIngGUSnNLrexM5P2sZgpj+hxxsMOHXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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