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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0830968c4cc9941c1e08ac7c7772731aa8204df927651fa2eb2307fece24a734' 
  AND token = 'f2T+U6VqChelQexMo0VmQLoA65JKuiEeBRVLH3osVFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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