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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e3424c21ee7c86e7ec6c4954260970ea9e2ec44fba2aeba8668eeaffa84e72b' 
  AND token = 'Sf1FLwgZg4yeVL2eQ0R23YK/IeZdQBQ2KZ7DE04+3OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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