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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd125ea83d6a8473640257cec6583b61d36d9e26ac9d98e732fc02aceb196b0e' 
  AND token = 't6eRfvjd/Ftdv16yY05B26ECmjn2UpzMDIspcE3nNu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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