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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e8e6ba2bfe269cd7065cab59ab05595a3b247e933df21d10210c427360823e' 
  AND token = '7T5wuDOv4sQs0mj/5MzM6iXOsIP0IL7m2+w6ZGpdYmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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