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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8659ceb19f7a8fd0d916d034efd90a0bec9479451452bea049ac0a7acd7a06a' 
  AND token = '/Atl/Jsq8N6CJkNRhkH0RczamT8WbFKHn4HpkKEMkJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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