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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a831d1f32e31f8159c277f282692dfbba7a9292c971f1b007336990b2edf9a99' 
  AND token = 'q8a/RHroGMhcb60EDK2ozm5BiGrMZNeB9oomf9/HO48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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