SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4245d01f82f6db0858ae03909b1aa8a79a7f01deb728c40c853de26b846db7d3' 
  AND token = '+tpl2n2z43ExpIJnmlKZu/9MNKHQHS2rmZfFv47V/cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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