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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86cc29c1e739b08fc6dfad1bedf1f0fa9dfed4475bacbf2769f361b9fb4406a4' 
  AND token = 'f/9r5LRv5/99U8woyJHDkonGQqjp8pzqfwV0vtgp6ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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