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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c13863df299c7936f0deb979be3d1cc62d801469e743e39b1ed662f4b36a03' 
  AND token = '2yGnPs9l5tvG7B1XDX53fIKfy2MkFBJl/twEPp7ZySI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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