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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023a4cb94613606447b2fa8a8dc9eb4abcaffa5548c3dad0d66ae4e8c2dcc60d' 
  AND token = 'K7+0uQzMl+SGiOrLDxiJEYTT+ZNeCign5R28cT8gi7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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