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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '349b2093712807cd209a06e219db0103c134b09fdb7a07a02fbca28b57768ef2' 
  AND token = 'yGM8IXv0D5wCnlzJDHg2KqF2Mal4OvCS1L7K4SGltNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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