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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a91a56fca9556307fc460e2bf174fa8528d5312433f3b73276678a18272f550' 
  AND token = 'TdU9wHdTwVKXZne/tYAVmpH75f6P2ft9DOM2Rryx9Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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