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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f7727da37fd48919092358a02a4494daa22a33f9e3a830442a24875f5c7751' 
  AND token = '5/VSBvsTtrUqxgMVerlk7Rno5g6Et7ZGJabVXez4L+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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