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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ccbe279a72851bf351b4b2e64d04dabed8290583a3e483e510e718d6dace1a' 
  AND token = 'VJy7D0tprp/wK7nXVzHV56yRdua/EewLTuua+PPg0HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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