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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f568cc4327e5ec971b1b2c2d03cf02ad9df3817298ee6730a4f4475656b92f08' 
  AND token = 'iihLekhOE5l6FpXzQ/M2ma+jeNWSSA5nGn5UBWhGdH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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