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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c85385577d8cf8888b11901b9c09eef903ee16cc66c9feefe8b2abe582183ce' 
  AND token = 'U+DCFu99hFJVwCxpkgNHn6aQXX/tdMED5tLvqvGWNH0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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