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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e82df68e99dc09784e10248bc04f925fc5541b171812cf194962719c6ed756' 
  AND token = 'INAI/Gydlto9Ha96i+8jxRS1tXGDStGhZf4jH8H6KuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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