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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '967f04709774be0ae2080d0fc7cc742b042fb11a3cc4d2f9886bab001c298285' 
  AND token = 'pgN7TgTTIXKKzM7AvLk+X66m8gDT9qpzFcQ+gUq9HUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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