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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edbcd0d9936a090b3806636dabf14089dcd41e2c18036c82c44a1fb1e199e036' 
  AND token = '6xhzIryk7Ax9MLELiDOeVohNmkdc/YjpdvHySo6mMDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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