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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bc06031587ba71e8665efcbccc13a8a868eff8651ab83d7d1bdd95198268f10' 
  AND token = 'PJWg5zB45nV8f86jupOZJniX/FZ/tEUeGgPeijV2bgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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