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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92ca8cc3e42ef380ffa76f9ac0facb67e2b34674cd785a83068ab80bc1e1fe51' 
  AND token = 'f3/sQ/JBziZSwLuyZ2BTqf9LiPPj6sXH0SDCRxiJ6Fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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