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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faf2aa4f2d456f0ff08938c13a35b9a7189526e404f00088663eda540a90a972' 
  AND token = 'QQTQRTGKlItmMobE7VGyyzobyefBICfdJnGHfs2rOlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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