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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a99b3652f1db66929c6daf444d29f51e9b227a78a6c3b72b1cb2e176285fd6' 
  AND token = 'Bl1oVSq+JO8SzHFAv671bGIle3ewqUFLyiFTvn10CEI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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