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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '311d18b914b9f0e6851521c8fdc3fbf2c51ec6e84b245a2e6ff24b4abaed6b2d' 
  AND token = '/muG78TKp41LuhNopn22uW+QH12BDBwBf/7RIb9VBFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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