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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dc956a6d6554d5c9af719ff88e8ced23cb08d8e4321fc5665016624afa513e6' 
  AND token = 'ppVc6ZOzHCgWEwKf+/DELf6B3oWMD1nPPCp6QGNoVlo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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