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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a4a8b7ae8131e56153525a26440355b3b068d4cf5ae51a3f2e77802c203f8d3' 
  AND token = '9OV0nxOMkSsC7JMHGG1Y1IEnMgpcCoPsUGbIngGLIQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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