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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ad31e967c4ecd5a838673b4cfb28d9e85f52ba0da81efed3760087c6a85a993' 
  AND token = 'XmfoZ+t26FNRuGkkgbS5VFp8r3JWZ+++Xof/PVxjaq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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