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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98765c09a68fd7d9c86cc81849c85b903c6db5cc1a3927ff37dbe80a36834e87' 
  AND token = 'hmbwCDcngU/vDZaTDV2TgEbMUN8keOBm9bwdFIICiYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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