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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a02f4aa9af99a99a7a14f19c42acdcb15ba843d52f7177e03f7d36228c1efd8' 
  AND token = '8NDyLJzTGEoxN8OJ9yPC/eGJSomtjBJP2SsRpNJQmWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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