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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97301bb8e635c0e6a4b709d1dad2070a1f2795579ece2b244675abe38f6e5721' 
  AND token = '89J9ccVtmpbDk5zjg4HsrgkyzIMYtYyWQ6+ulx48ib4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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