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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32cace16ef0f195d414a8821548293dc5c463962d67741152a56ea201b926c37' 
  AND token = '5sYu5/4TESrdxanO4i5DmD/BYThPlCFzm/5PXn2SJoE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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