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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b4c84019bbea8c0f8d63ac49f938cfc6d257f29464533ffc9f6e38b12776a45' 
  AND token = 'oVg9gMow/ZWUxhswbpi3V6fsgTr1fiTbV7XcujtpMk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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