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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22774ef120fc34fb9254acb686a5a1a0b46db7c0155f5d6181284f137ec27a30' 
  AND token = 'XefRZnE2nVUeERrVrON6VdQzDcAMtxOTzqUsQmxng0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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