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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1d0437ecbea2ee64b7b53089ea2d6e659bcc1df82f972747a0457b67b7774ed' 
  AND token = 'VwjawiJp7B1HF2vEucsMVsu6XiuOKrtRj97us5N0h4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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