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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a672789f32b5057906583f2f283853c211d2d929c0a667a86d13d9b7f238a6a2' 
  AND token = 'iktqD9/nJevo7LyTJYtcDY4a9sbKvexDyZCCk/uGCdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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