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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4839d30d9b03d5856fbb6d5ab5f04b234e70c4c8c0f3b73fec68a22edc854a52' 
  AND token = 'GNxvrGO/EqGPgD2VxRaDKtYE8RZ7u9qXG0ddWXCRPlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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