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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82427c5c4c6780b227b7d87734ad1c524361ea0c3137409b5230b141e6ede36b' 
  AND token = 'bfibR3h73eP0jXaKDT/nBb7lGYnijWYLtaNyBU2itos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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