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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4edeba82aad840df5056dd8b2f02ed095b487598e15b2f186a5900a6348889ec' 
  AND token = 'ihepCb1R2UNXbK/esypW17+57EnYz9nFmUr1BtEk/Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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