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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec780d8c957a75b8c57ab0062e72afddaa607992ad2d5ffcc041d7d6b2346de' 
  AND token = '89zQhkggTH1ZjYEHb4yhXDJfiB8emeRMn0xZdEDnVeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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