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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c7a9ac25e654ba0eddf552e1bb002de41c5eeabf72cad04703ac132a1c050db' 
  AND token = 'ADfRmtqIY2jD9zsAE2BwTsj9B9T6TfdVgNFuD+k6D7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00094

JSON explain

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