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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90c87c4ba48be51f63ba448eb04f1a30ffddf9a8a34f618af21aa03ef6329b28' 
  AND token = 'gNSc953QZvMXOeahgCQu73fHqsBaNQ1PnU1RvAH/e2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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