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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04e26d5534fdf148f2b7e26e3416b1704820eb81959e5261b81e4f1d1a1fc3a0' 
  AND token = 'ZEc73Wg8ozggLhX52VQXEsuFBOX8JxX/qa8t/3KMyxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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