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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5720169fe28e66693fc2126153c499b054a8ea23d5c1be1b57660955e8f1fdd2' 
  AND token = 'kWxQIVYQbDQ3PfdPsamH62zSC8US2yzI0J+GSE1v5tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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