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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84637279ac55f6dc0bfd697a5e7ba778a8c794b199ec49c3af15b2fcf597b32' 
  AND token = 'y6+ex2uwvrVdVQs4oNj8TbkBDQhU/Reqjoul2IQIKaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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