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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4cd0a5d939e9e5461627db998c7d7fbf6fd4a4be8ca9982f7ea5c00729360af' 
  AND token = 'gfVRCJLrI0842L+Yuew/zsw27caJQlDra47mIv3L3rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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