SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4940bc2e6658f6286f56c218202308ca52341a1511763e439bd03ce0943287c7' 
  AND token = 'Z7hJ5BglR52YPcDr1N7/1WHIjLoFNpOrYDimHKpvn4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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