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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad547f9754126a368ec79b6920f935335e61fd59e86e0b75e5a6b347111f8a6f' 
  AND token = 'C5GX8x8fjp4AwuicA5AmFTgnCNAqy/4KpQuL0D7OF60=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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