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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '559b41b3f260a6f175b19f9f88a5bb69239d37129b9092e6d3f4967cad6defd1' 
  AND token = 'KTAP7e8SpzmTx5WeeUSGjKv8brtWCm9MJH0MZg84vIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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