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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd3d0be83030830e288d2bfb24a214e528e01d41d5c451c2ddccd96c992c371' 
  AND token = 'YLdyVgXudZaLoNU9gZ3akrYCBH48ivKR+YjfwEevzWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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