SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32dccc4fe6195d87ce6499156eb68d0087fbc2136ee0a5a7cc52688937ab6ea9' 
  AND token = 'jxKNegMcn2v2ffwvZKp+jPh/BTOpbrWZNI1ZyV+TLjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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