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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3426ab3b3035a0258d0857bc1c2406acb5a50c31a43c096b54b2535a57cb89dd' 
  AND token = 'kedjiNUCjYx6LrxnRHTklgNODSUG+F+PMf5JQe/kiK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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