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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d595e4dd6a612968ec386c97613df549d11e7fab8e14f02fa810237c1b336e0' 
  AND token = 'DTmXkq+5VQni1ok1oAeBR6ibc9Fl5GVZQkyJgfscIVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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