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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63bc6d2b1302088d6a986541a9409eb95095186ee11bb11e281fa4be843d3717' 
  AND token = 'hfFAc7qqPcW+LfpX9B4qp+TOTs8NfTj315BDEPA4Sl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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