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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23d14a0d0eb616b7d3c10b4eb93c4d302e562cb76a14eff465ab5a3d9171921f' 
  AND token = 'rHIMxTcbP/JSZsfeHZJ96J4IdTp4IdFfi51KZ/wIyxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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