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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c61f32b7a7971792574f976fcb5755c240941271eb13c3f79d3d58532f171d16' 
  AND token = '2An8CwWVom/Vcdd7TrDRghYA60aD6ka4A706ShNn9Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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