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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8ca5834a9dfcbb8e3f3572493c5b5a2a5d38cbc46bde34d8ae5eff30c560a1' 
  AND token = 'o1Gni3l4JDW42f8CqpbB72kUNpgIgl5fowEdALZQQ8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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