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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ebda0bc367f66b9c143f8de3fb2034d70ed1f0f4c337d9b20f19b6ea2b88fc0' 
  AND token = '8L+5l46uuGTv1fEke0RLUr12OXFEBqbHiiYQ/P0kaJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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