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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94e83a01037e8ddf116821cddda1d166196b439cfb4d36f2cb1add05b81cf8f7' 
  AND token = 'B+pp2nVJ3hewl9O+Q0dR3gjHWCguNcVVROjdrw/Nn7Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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